[Dynomite]

Originally Posted by sammy

the 90 gap is 35 i believe , what year did they change it to 50 . i run mine at 40. the plugs for the 93 that wasnt a gasket plug came from ngk @50. i wonder if there are any changes to the electronics when they upped the gap????????????

I miss spoke... .043 gap

http://www.ngk.com/results_app.asp?AAIA=1041297

For 91' ZR1......NGK Iridium BKR5EIX
Iridium IX Plug, 14mm Thread Size, 19mm (3/4") Reach, 5/8" (16mm) Hex Size, Gasket Seat, Resistor, Solid Terminal Nut, ISO Length, Projected Tip, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode, .043" (1.1mm) Gap, Heat Range 5